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Noun: heedlessness  heed-lus-nus
  1. A lack of attentiveness (as to children or helpless people)
    - inattentiveness
  2. The trait of acting rashly and without prudence
    - mindlessness, rashness
  3. The trait of forgetting or ignoring your responsibilities
    - unmindfulness, inadvertence, inadvertency

Type of: attentiveness, imprudence, inattention

Antonym: heed, mindfulness